Oenothera fruticosa (Sundrops) http://ietin.notlong.com 14 June 2008 Oenothera fruticosa (Sundrops) There are two clumps of the perennial Sundrops. I keep the plant contained by digging a trench around the clump. The plant blooms about two weeks, and the vegetation is still a dark attractive green throughout the season. Common Names: Golden sundrops,· Narrow leaf evening primrose.